1 files changed, 3 insertions, 3 deletions
diff --git a/packages/connect/src/ws_orderbook_channel.ts b/packages/connect/src/ws_orderbook_channel.ts
index e1c55cce3..fa9f5e37f 100644
--- a/packages/connect/src/ws_orderbook_channel.ts
+++ b/packages/connect/src/ws_orderbook_channel.ts
@@ -15,9 +15,9 @@ import { orderbookChannelMessageParser } from './utils/orderbook_channel_message
  * that implements the standard relayer API v0
  */
 export class WebSocketOrderbookChannel implements OrderbookChannel {
-    private _client: WebSocket.w3cwebsocket;
-    private _handler: OrderbookChannelHandler;
-    private _subscriptionOptsList: OrderbookChannelSubscriptionOpts[] = [];
+    private readonly _client: WebSocket.w3cwebsocket;
+    private readonly _handler: OrderbookChannelHandler;
+    private readonly _subscriptionOptsList: OrderbookChannelSubscriptionOpts[] = [];
     /**
      * Instantiates a new WebSocketOrderbookChannel instance
      * @param   client               A WebSocket client